This atom in its unbound state has four valence electrons. These electrons readily form single, double, and even triple bonds among themselves to become stable. This atom is:
A. carbon.
B. hydrogen.
C. oxygen.
D. nitrogen.
E. phosphorus.
A. carbon.
Biology & Microbiology
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The seed coat is formed by the hardening of the
A. prothallus. B. embryo. C. ovule. D. endosperm. E. integument.
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During gas exchange, oxygen and carbon dioxide always move:
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